A 0.1-W small cylindrical resistor mounted ona lower part of a vertical circuit board is 0.3 in long andhas a diameter of 0.2 in. The view of the resistor is largelyblocked by another circuit board facing it, and the heat transferthrough the connecting wires is negligible. The air is free to flow through the large parallel flow passages between theboards as a result of natural convection currents. If the airtemperature at the vicinity of the resistor is 120°F, determinethe approximate surface temperature of the resistor. Evaluateair properties at a film temperature of 170°F and 1 atm pressure.Is this a good assumption?
A 0.1-W small cylindrical resistor mounted ona lower part of a vertical circuit board is 0.3 in long andhas a diameter of 0.2 in. The view of the resistor is largelyblocked by another circuit board facing it, and the heat transferthrough the connecting wires is negligible. The air is free to flow through the large parallel flow passages between theboards as a result of natural convection currents. If the airtemperature at the vicinity of the resistor is 120°F, determinethe approximate surface temperature of the resistor. Evaluateair properties at a film temperature of 170°F and 1 atm pressure.Is this a good assumption?
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter25: Surge, Spike, And Lightning Protection
Section: Chapter Questions
Problem 10RQ: In reference to the load, how are capacitors connected to help prevent voltage spikes and surges?...
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Question
A 0.1-W small cylindrical resistor mounted on
a lower part of a vertical circuit board is 0.3 in long and
has a diameter of 0.2 in. The view of the resistor is largely
blocked by another circuit board facing it, and the heat transfer
through the connecting wires is negligible. The air is free to flow through the large parallel flow passages between the
boards as a result of natural convection currents. If the air
temperature at the vicinity of the resistor is 120°F, determine
the approximate surface temperature of the resistor. Evaluate
air properties at a film temperature of 170°F and 1 atm pressure.
Is this a good assumption?
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